271 research outputs found
(2,7-Dimethoxynaphthalene-1,8-diyl)bis(4-fluorobenzoyl)dimethanone
The title compound, C26H18F2O4, is a naphthalene derivative in which the two aroyl groups at the 1- and 8-positions (peri positions) are anti to each other. There is an appreciable difference in the dihedral angles between the naphthalene ring system and the two benzene rings [66.88 (7)° and 88.09 (6)°]. In the crystal, weak C—H⋯O interactions involving one of the carbonyl groups and an aromatic C—H group ortho to the F atom seem to stabilize the packing of the molecules
Consórcios intermunicipais para a destinação de RSU em aterros regionais: estudo prospectivo para os municípios no Estado do Paraná
<Abstract of annual report>Special Features of Stable Free Radical Formation on Plasma-irradiated α-D-Glucose Studied by ESR Spin Trapping Technique.
<Abstract of annual report>Natre of Free Radical Formation in Acrylic Resins by Plasma-Irradiation.
1,8-Dibenzoyl-2,7-dimethoxynaphthalene
The molecule of the title compound, C26H20O4, is located on a twofold rotation axis. The two benzoyl groups are situated in an anti orientation. The dihedral angle between the mean planes of the phenyl ring and the naphthalene ring system is 80.25 (6)°. The phenyl and carbonyl groups in each benzoyl group are almost coplanar. The molecular packing is stabilized by weak C—H⋯O hydrogen bonds and a π–π stacking interaction between the phenyl rings [centroid–centroid and interplanar distances of 3.6383 (10) and 3.294 Å, respectively]
1-(4-Chlorobenzoyl)-2,7-dimethoxynaphthalene
In the title compound, C19H15ClO3, the dihedral angle between the naphthalene ring system and the benzene ring is 72.06 (7)°. The 4-chlorophenyl group and the carbonyl group are almost coplanar. An intermolecular C—H⋯O hydrogen bond is formed between an H atom of the 4-chlorophenyl group and the O atom of one methoxy group, forming a zigzag chain along the a axis
1,8-Bis(4-chlorobenzoyl)-7-methoxynaphthalen-2-ol ethanol monosolvate
In the title compound, C25H16Cl2O4·C2H6O, the two 4-chlorobenzoyl groups are in syn orientations with respect to the naphthalene ring system and are approximately parallel to each other: the dihedral angle between the benzene rings is 11.43 (16)°. The conformation around each of the carbonyl C—(C=O)—C groups forms a larger angle to the plane of the naphthalene ring system than that to the benzene ring; the angles of the C=O bond vector with the naphthalene ring system and the benzene ring are 55.4 (3) versus 13.5 (3)° and 52.2 (3) versus 17.9 (3)°. An intramolecular O—H⋯O=C hydrogen bond generates a six-membered ring. In the crystal structure, intermolecular O—H⋯O hydrogen bonds including the ethanol solvent molecule are observed. A C—H⋯O interaction also occurs. The ethyl group of the ethanol molecule is disordered over two positions with site occupancies of 0.63 and 0.37. The crystal studied was an inversion twin
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